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Nested bind does not propagate under specific circumstances #18249

Description

@Tinggaard

Describe the bug

Version 5.55.6 introduced a bug when having a nested bind directive, and updating its value from the outermost parent after it has been mounted, which does not cause a proper rerender of the child (the value does seem to update).

These "special circumstances" include a (seemingly empty) boundary as well.

So far I have only verified the bug using bits-ui, but maybe it could be reproduced with something a bit more native as well...

Reproduction

https://svelte.dev/playground/c0d95a62bb3a4bb1910bea0c6fd9bc6a?version=latest

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Severity

blocking an upgrade

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